qca-wifi: Replace 8074_VP with WIFI_EMULATION_3_0

Replace QCA_WIFI_QCA8074_VP with CONFIG_WIFI_EMULATION_WIFI_3_0
since VP platform is not being used anymore.
Most of the parameters present inside QCA_WIFI_QCA8074_VP are related
to emulation timeouts. Hence replacing it with a more meaningful flag.

Change-Id: I066cd86fe6ee15a1c3e8d7d656d3cf7d4a4b9d1b

configs/wlan_cfg/ap_wlan_cfg.config

@@ -22,7 +22,7 @@ EXTRA_CFLAGS += -DDP_TX_NAPI_BUDGET_DIV_MASK=0xFFFF
 EXTRA_CFLAGS += -DCONFIG_PROCESS_RX_STATUS=0
 EXTRA_CFLAGS += -DCONFIG_PROCESS_TX_STATUS=0
 EXTRA_CFLAGS += -DWLAN_CFG_MAC_PER_TARGET=3
-ifeq ($(strip ${QCA_WIFI_QCA8074_VP}),1)
+ifeq ($(strip ${CONFIG_WIFI_EMULATION_WIFI_3_0}),1)
 EXTRA_CFLAGS += -DWLAN_CFG_NUM_TX_DESC=0x2000
 else
 EXTRA_CFLAGS += -DWLAN_CFG_NUM_TX_DESC=0x320000